Discussion
When both horizontal lines are of the same length and have the same visual angle, but on the top appear longer. What is this illusion called ?
Answer: B
This is the Ponzo illusion.
Two identical horizontal lines are drawn between two lines that converge towards the top, like railway tracks receding into the distance. The upper line looks longer, although both lines are the same length and cast the same image on the retina. The usual explanation is size constancy: the converging lines signal depth, so the upper line is taken to be farther away and is therefore seen as larger.
The Muller-Lyer illusion uses arrowhead fins at the ends of two lines, not converging lines. 'Visual illusion' and 'depth illusion' are general categories, not the name of this particular figure.
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